In the glory days of Abalone diving the divers had progressed to using surface supplied free flow Abalone mask or "swimmer helmets." The normal searching, harvesting and swimming position was at a very acute angle literally walking on their fin tips.
The fin of choice was the original Churchill with its short blade or a pair of Duck feet.(foot?). either pair of fins would have been severely shorted by the diver in order for the diver to walk on their toes,
Swim fin shorting has been done and it can be done... Use a hand held jig saw or a table mounted jig saw to shorten your blade,
It is becoming colder by the day where you reside soon there will be snow ice sleet rain and who know what else? So time to relax and increase your knowledge on dive fins.
It is suggest that for information on the history of fins you
might want to read the thread on this board as
@Akimbo suggested or my articles published almost a quarter of a century ago before the electronic highway and google and the SCUBA board in the Historical Diving Society's "
Historical Diver" "A Short History of Fins"
A) # 3 1994, Part 1
B) # 4 1994 Part 11
C) # 5 Part 111
Good luck and Cheers from CenCal
Sam Miller, 111